A statistics instructor is curious about whether a relationship exists between the scores of students who purchased

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A statistics instructor is curious about whether a relationship exists between the scores of students who purchased the student workbook and those of students who did not. Because he did not require students to buy the workbook, some bought it and others didn’t. The grades are recorded here and are believed not to follow a normal distribution.image text in transcribed

Do a test to see whether buying the workbook improved the grades. Use 5 percent. Assume that the data do not follow a normal distribution.

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Related Book For  book-img-for-question

Statistics For Business And Financial Economics

ISBN: 9781461458975

3rd Edition

Authors: Cheng Few Lee , John C Lee , Alice C Lee

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